EP2566963A1 - Sensors for the detection of intracellular metabolites - Google Patents
Sensors for the detection of intracellular metabolitesInfo
- Publication number
- EP2566963A1 EP2566963A1 EP11724947A EP11724947A EP2566963A1 EP 2566963 A1 EP2566963 A1 EP 2566963A1 EP 11724947 A EP11724947 A EP 11724947A EP 11724947 A EP11724947 A EP 11724947A EP 2566963 A1 EP2566963 A1 EP 2566963A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cell
- metabolite
- seq
- promoter
- protein
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- AIUDWMLXCFRVDR-UHFFFAOYSA-N dimethyl 2-(3-ethyl-3-methylpentyl)propanedioate Chemical class CCC(C)(CC)CCC(C(=O)OC)C(=O)OC AIUDWMLXCFRVDR-UHFFFAOYSA-N 0.000 description 1
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 description 1
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- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
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- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
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- 238000004007 reversed phase HPLC Methods 0.000 description 1
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- 229920002545 silicone oil Polymers 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- IFGCUJZIWBUILZ-UHFFFAOYSA-N sodium 2-[[2-[[hydroxy-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyphosphoryl]amino]-4-methylpentanoyl]amino]-3-(1H-indol-3-yl)propanoic acid Chemical compound [Na+].C=1NC2=CC=CC=C2C=1CC(C(O)=O)NC(=O)C(CC(C)C)NP(O)(=O)OC1OC(C)C(O)C(O)C1O IFGCUJZIWBUILZ-UHFFFAOYSA-N 0.000 description 1
- 239000004455 soybean meal Substances 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
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- 239000007858 starting material Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
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- 229960002363 thiamine pyrophosphate Drugs 0.000 description 1
- AYEKOFBPNLCAJY-UHFFFAOYSA-O thiamine pyrophosphate Chemical compound CC1=C(CCOP(O)(=O)OP(O)(O)=O)SC=[N+]1CC1=CN=C(C)N=C1N AYEKOFBPNLCAJY-UHFFFAOYSA-O 0.000 description 1
- YXVCLPJQTZXJLH-UHFFFAOYSA-N thiamine(1+) diphosphate chloride Chemical compound [Cl-].CC1=C(CCOP(O)(=O)OP(O)(O)=O)SC=[N+]1CC1=CN=C(C)N=C1N YXVCLPJQTZXJLH-UHFFFAOYSA-N 0.000 description 1
- 229960002898 threonine Drugs 0.000 description 1
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- IEDVJHCEMCRBQM-UHFFFAOYSA-N trimethoprim Chemical compound COC1=C(OC)C(OC)=CC(CC=2C(=NC(N)=NC=2)N)=C1 IEDVJHCEMCRBQM-UHFFFAOYSA-N 0.000 description 1
- 229960004799 tryptophan Drugs 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
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- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6897—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids involving reporter genes operably linked to promoters
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
- A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
- A23L33/17—Amino acids, peptides or proteins
- A23L33/175—Amino acids
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/185—Acids; Anhydrides, halides or salts thereof, e.g. sulfur acids, imidic, hydrazonic or hydroximic acids
- A61K31/19—Carboxylic acids, e.g. valproic acid
- A61K31/195—Carboxylic acids, e.g. valproic acid having an amino group
- A61K31/197—Carboxylic acids, e.g. valproic acid having an amino group the amino and the carboxyl groups being attached to the same acyclic carbon chain, e.g. gamma-aminobutyric acid [GABA], beta-alanine, epsilon-aminocaproic acid or pantothenic acid
- A61K31/198—Alpha-amino acids, e.g. alanine or edetic acid [EDTA]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61P3/00—Drugs for disorders of the metabolism
- A61P3/02—Nutrients, e.g. vitamins, minerals
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
- C12N15/115—Aptamers, i.e. nucleic acids binding a target molecule specifically and with high affinity without hybridising therewith ; Nucleic acids binding to non-nucleic acids, e.g. aptamers
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/67—General methods for enhancing the expression
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/70—Vectors or expression systems specially adapted for E. coli
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/74—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora
- C12N15/77—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora for Corynebacterium; for Brevibacterium
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- C12P13/00—Preparation of nitrogen-containing organic compounds
- C12P13/04—Alpha- or beta- amino acids
- C12P13/08—Lysine; Diaminopimelic acid; Threonine; Valine
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- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
- C12Q1/6888—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms
- C12Q1/689—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms for bacteria
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- C12N2310/00—Structure or type of the nucleic acid
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- C12N2310/16—Aptamers
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- C12N2310/00—Structure or type of the nucleic acid
- C12N2310/30—Chemical structure
- C12N2310/35—Nature of the modification
- C12N2310/351—Conjugate
- C12N2310/3519—Fusion with another nucleic acid
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- C12Q2600/00—Oligonucleotides characterized by their use
- C12Q2600/156—Polymorphic or mutational markers
Definitions
- the present invention relates to a cell genetically engineered with respect to its wild-type, a method for identifying a cell having increased intracellular concentration of a particular metabolite, a method for producing a cell genetically engineered with respect to its wild-type with optimized production of a particular metabolite, a cell obtained by this method , a process for producing metabolites, and a process for producing a mixture.
- Microbiologically produced metabolites are of great economic interest.
- amino acids such as L-lysine, L-threonine, L-methionine and L-tryptophan are added as feed, L-glutamate as a spice additive, L-isoleucine and L-tyrosine in the pharmaceutical industry, L-arginine and L-isoleucine as a drug or L-glutamate, L-aspartate and L-phenylalanine used as the starting material for the synthesis of fine chemicals.
- Another example of a metabolically relevant metabolite is oxoglutarate, which is used as a dietary supplement or as a precursor to argenine alpha ketoglutarate, which promotes the release of growth hormone and insulin.
- a preferred method for producing such metabolites is the biotechnological production by means of microorganisms.
- the biologically active and optically active form of the respective metabolite and also simple and inexpensive raw materials are used.
- microorganisms z.
- WO-A-2005/059139 discloses the production of L-lysine by means of a genetically engineered Corynebacterium glutamicum strain in which increased L-lysine production is achieved by improving metabolism via the pentose phosphate pathway.
- WO-A-97/23597 an increase in the production of amino acids such as L-lysine in microorganisms is achieved by increasing the activity of export carriers which channel these amino acids out of the cell.
- overproducers are usually obtained by searching for mutants which produce the metabolite in a particularly large amount. This screening is called “screening.” In screening, random mutations (undirected mutagenesis) are usually induced in a parent strain using common chemical or physical mutagens (eg, MNNG or UV), and mutants are selected by conventional microbiological methods.
- screening random mutations (undirected mutagenesis) are usually induced in a parent strain using common chemical or physical mutagens (eg, MNNG or UV), and mutants are selected by conventional microbiological methods.
- MNNG chemical or physical mutagens
- the object of the present invention was to provide a genetically modified cell in which, following a mutation, those mutants which produce an overproduction of a particular metabolite can be identified in a simple manner and, if appropriate, separated from the remaining cells.
- Another object of the present invention was to provide a method for identifying a cell with increased intracellular concentration of a particular metabolite, which in a particularly simple and cost-effective manner, identifying and optionally selectively separating such a cell in or out of a plurality of Cells, for example, in or out of a cell suspension allows.
- a contribution to the solution of the abovementioned objects is made by a genetically modified cell which comprises a gene sequence coding for an autofluorescence protein, the expression of the autofluorescence protein being dependent on the intracellular concentration of a specific metabolite.
- tfetabolit as used herein is to be understood in general as an intermediate of a biochemical pathway, wherein according to the invention amino acids or amino acid derivatives, for example L-isoleucine, L-leucine, L-valine, L-lysine, L-arginine , L-citrulline, L-histidine, L-methionine, L-cysteine L-tryptophan, L-glycine or O-acetyl-L-serine, nucleotides or nucleotide derivatives, for example xanthine, GTP or cyclic diguanosine monophosphate, fatty acids or fatty acid derivatives, for example acyl Coenzyme A thioester, sugar or sugar derivatives, for example glucose, rhamnose, ribulose-bis-phosphate, beta-D-galactoside or D-glucosamine-6-phosphate, keto acids, for example oxoglutarate, antibiotics, for example thioest
- Metabolites are understood in particular amines, phosphates or esters of the corresponding compounds.
- Very particularly preferred metabolites are amino acids, in particular an amino acid selected from the group consisting of L-isoleucine, L-leucine, L-valine, L-lysine, L-arginine, L-citrulline, L-histidine, L-methionine, L-lysine.
- Cysteine, L-tryptophan, O-acetyl-L-serine more preferably selected from the group consisting of L-lysine, L-arginine, L-citrulline and L-histidine.
- the most preferred metabolite in accordance with the invention is L-lysine.
- a "wild-type" of a cell is preferably understood to mean a cell whose genome is in a state as naturally produced by evolution. The term is used for both the entire cell and for individual genes. fall therefore in particular not such cells or genes whose gene sequences have been at least partially modified by humans by recombinant methods.
- Particularly preferred cells according to the invention are those of the genera Corynebacterium, Brevibacterium, Bacillus, Lactobacillus, Lactococcus, Candida, Pichia, Kluveromyces, Saccharomyces, Escherichia, Zymomonas, Yarrowia, Methylobacterium, Ralstonia and Clostridium, Brevibacterium flavum, Brevibacterium lactofermentum, Escherichia coli, Saccharomyces cerevisiae , Kluveromyces lactis, Candida blankii, Candida rugosa, Corynebacterium glutamicum, Corynebacterium efficiens, Zymonomas mobilis, Yarrowia lipolytica, Methylobacterium extorquens, Ralstonia eutropha and Pichia pastoris are particularly preferred. Most preferred cells according to the invention are those of the genus Corynebacterium and Escherichia, with
- the genetically modified cells may in particular be selected from cells selected from the group consisting of Corynebacterium glutamicum ATCC13032, Corynebacterium acetocutamicum ATCC15806, Corynebacterium acetoacidophilum ATCC13870, Corynebacterium molassecola ATCC 17965, Corynebacterium thermoaminogenes FERM BP-1539, Brevibacterium flavum ATCC14067, Brevibacterium lactofermentum ATCC 13869 and Brevibacterium divaricatum ATCC 14020, and L-amino acid producing mutants thereof such as the L-lysine producing strains Corynebacterium glutamicum FERM-P 1709, Brevibacterium flavum FERM-P 1708, Brevibacterium lactofermentum FERM-P 1712, Corynebacterium glutamicum FERM-P 6463, Coryne
- Escherichia co / i ' strains are Escherichia coli AJ1 1442 (see JP 56-18596 and US 4,346,170), Escherichia co / z ' strain VL61 1 and Escherichia co / z ' strain WC 196 (see WO-A -96 / 17930).
- the genetically modified cells according to the invention are now characterized in that they contain a gene sequence coding for an autofluorescent protein, the expression of this autofluorescent protein being dependent on the intracellular concentration of a particular metabolite.
- Suitable gene sequences coding for an autofluorescent protein are all gene sequences known to those skilled in the art which code for an autofluorescent protein. Particularly preferred are gene sequences which are fluorescent for proteins of the genus Aequora, such as the Green Fluorescent Protein (GFP), and variants thereof, which fluoresce in a different wavelength range (eg Yellow Fluorescent Protein, YFP, Blue Fluorescent Protein, BFP, Cyan Fluorescent Protein, CFP) or whose fluorescence is enhanced (enhanced GFP or EGFP, or EYPP, EBFP or ECFP) encode. Furthermore, according to the invention gene sequences can also be used which are suitable for other autofluorescent proteins, e.g.
- GFP Green Fluorescent Protein
- the control of the expression of the gene sequence coding for the autofluorescence protein takes place in dependence on the intracellular concentration of the particular metabolite at the level of transcription. Depending on the intracellular concentration of the respective metabolite, more or less less NA formed, which can be translated in the ribosomes to form the autofluorescent protein.
- the control of the expression at the level of translation can take place in that the gene sequence coding for the autofluorescence protein is under the control of a heterologous promoter expressing a gene in the wild type of the cell whose expression in the wild-type cell is dependent on the intracellular concentration of a particular metabolite.
- the gene sequence encoding the autofluorescent protein may be under the control of a promoter derived from such a promoter.
- the phrase "under the control of a heterologous promoter” indicates that the promoter in nature, particularly in the wild-type cell from which the promoter sequence was isolated and optionally engineered to further enhance promoter efficiency, does not express the expression of the autofluorescent protein
- the phrase "derived from such a promoter” means that the promoter contained in the genetically engineered cell that regulates the expression of the gene sequence encoding the autofluorescent protein need not be a promoter having identical nucleic acid sequence in Rather, this promoter sequence may have been altered for the purpose of increasing the promoter efficiency, for example by insertion, deletion or exchange of individual bases, for example by palindromization of individual nucleic acid sequences s the promoter which regulates the expression of the gene sequence encoding the autofluorescent protein is not necessarily a promoter or derived from a promoter contained in the genome of the genetically engineered cell itself.
- the promoter is a promoter is derived from a promoter which is contained in the genome of the genetically engineered cell itself, but there controls the expression of a gene whose expression is dependent on the intracellular concentration of a particular metabolite.
- the gene sequence coding for the autofluorescence protein is under the control of a promoter in this embodiment of the cell according to the invention.
- the term "under the control of a promoter” is preferably to be understood as meaning that the gene sequence coding for the autofluorescence protein is functionally linked to the promoter
- Functionally linked are the promoter and the gene sequence coding for the autofluorescence protein, if these two sequences as well optionally further regulatory elements, such as a terminator, are arranged in such a way that each of the regulatory elements can fulfill its function in the transgenic expression of the nucleic acid sequence.
- enhancer sequences can also exert their function on the target sequence from more distant positions or even from other DNA molecules, Preferred arrangements are those in which the autofluorescent protein-encoding gene sequence lies behind (ie at the 3 'end) of the promoter sequence pos Isioniert, so that both sequences are covalently linked together.
- the distance between the gene sequence coding for the autofluorescence protein and the promoter sequence is preferably less than 200 base pairs, particularly preferably less than 100 base pairs, very particularly preferably less than 50 base pairs. It is also possible for the gene sequence coding for the autofluorescence protein and the promoter to be functionally linked to one another in such a way that between these two gene sequences a partial sequence of the homologous gene (ie that gene whose expression in the wild-type cell is regulated by the promoter) are located. In the expression of such a DNA construct, a fusion protein from the autofluorescent protein and the Amino acid sequence which is encoded by the corresponding partial sequence of the homologous gene obtained. The length of such partial sequences of the homologous gene are not critical, as long as the functionality of the autofluorescence protein, ie its property to fluoresce upon excitation with light of a certain wavelength, is not appreciably impaired.
- the cell according to the invention may also comprise a gene sequence coding for the regulator, wherein the regulator is preferably a protein which in some way interacts with the metabolite and the promoter this influences the binding affinity of the promoter sequence to the RNA polymerase.
- the interaction between the regulator and the promoter sequence is dependent on the presence of the metabolite.
- the metabolite is bound to specific, functional regions of the regulator and thus causes a conformational change of the regulator, which has an effect on the interaction between the regulator and the promoter sequence.
- the regulator can basically be an activator or a repressor.
- promoters which normally control the expression of a gene whose expression is dependent on the intracellular concentration of a specific metabolite are generally suitable as promoters according to the invention.
- the promoter is a promoter which normally controls the expression of a gene whose expression is dependent upon the intracellular concentration of a particular metabolite and which encodes a protein which is capable of reducing the intracellular concentration of a metabolite either via a chemical conversion of the metabolite or via the removal of the metabolite from the cell allows.
- This protein is therefore either an enzyme which implements the metabolite in one of the metabolites catalyzes various metabolite or an active or passive transporter that catalyzes the efflux of the metabolite out of the cell.
- the promoters may be promoters which interact with certain activators in the presence of the metabolite and thus cause the expression of the gene sequence coding for the autofluorescent protein, or promoters which are inhibited by a repressor, wherein the repressor passes through Interdiffused with a particular metabolite from the promoter, which eliminates the herniation and the expression of the coding for the autofluorescent protein gene sequence is effected.
- the genetically modified cell according to the first embodiment may be a genetically engineered cell, preferably a genetically engineered Pseudomonas putida cell, which comprises a gene sequence coding for an autofluorescent protein, which can be found among the Control of the bfei promoter (for BkdR regulator in Pseudomonas putida, see, for example, J. Bact., 181 (1999), pp. 2,889-2,894, J. Bact., 187 (2005), p. 664;).
- an increased intracellular concentration of L-isoleucine, L-leucine, L-valine or D-leucine leads to an expression of the autofluorescence protein.
- such a cell preferably also has a gene sequence coding for the BkdR regulator (branched-chain keto acid dehydrogenase regulatory protein).
- BkdR regulator branched-chain keto acid dehydrogenase regulatory protein. The DNA sequence of the BdkR regulator regulated bfo / promoter is shown in SEQ. 01 and the sequence of the BkdR regulator itself in SEQ. 02 reproduced.
- the genetically engineered cell according to the first embodiment may be a genetically engineered cell, preferably a genetically engineered Bacillus subtilis cell comprising a gene sequence coding for an autofluorescent protein, which is under the control of the acL4 promoter (for the CodY repressor see Mol. Mic. 62 (2006), page .81 1).
- acL4 promoter for the CodY repressor see Mol. Mic. 62 (2006), page .81 1).
- an increased intracellular concentration of L-isoleucine, L-leucine and L-valine leads to an expression of the autofluorescence protein.
- such a cell preferably also has a gene sequence coding for the CodY repressor.
- the DNA sequence of the codY activator-regulated ackA promoter is shown in SEQ. 03 and the sequence of the CodY activator itself in SEQ. ID. 04 reproduced.
- the genetically modified cell according to the first embodiment may also be a genetically modified cell, preferably a genetically engineered Pseudomonas putida cell, which comprises a gene sequence coding for an autofluorescent protein, which is under the control of the mcfe i. Promoter (for MdeR regulator see J. Bacteriol., 179 (1997), page 3,956).
- a genetically modified cell preferably also has a gene sequence coding for the MdeR regulator.
- the DNA sequence of the MdeR regulator regulated m ⁇ e i promoter is shown in SEQ. 05 and the sequence of the MdeR regulator itself in SEQ. ID. 06 reproduced.
- the genetically modified cell according to the first embodiment may be a genetically modified cell, preferably a genetically engineered Corynebacterium glutamicum cell comprising a gene sequence coding for an autofluorescent protein, which is under the control of the br iF promoter (for the Lrp regulator in Corynebacterium glutamicum see J. Bact., 184 (14) (2002), pages 3,947-3,956).
- an increased intracellular concentration of L-isoleucine, L-leucine and L-valine leads to an expression of the autofluorescence protein.
- such a cell preferably also has a gene sequence coding for the Lrp regulator.
- the DNA sequence of the Lrp regulator regulated 6r "promoter is shown in SEQ. ID. -No. 07 and the sequence of the Lrp regulator itself in SEQ. 08 reproduced.
- the genetically modified cell according to the first embodiment may be a genetically modified cell, preferably a genetically modified Escherichia coli cell comprising a gene sequence coding for an autofluorescent protein, which is under the control of the cys promoter (for the CysB regulator in Escherichia coli see Mol. Mic, 53 (2004), page 791).
- such a cell preferably also has a gene sequence coding for the CysB regulator.
- the DNA sequence of the CysB regulator regulated cys promoter is shown in SEQ. 09 and the sequence of the Lrp regulator itself in SEQ. 10 reproduced.
- the genetically modified cell according to the first embodiment may also be a genetically modified cell, preferably a genetically modified Escherichia coli cell, which is one of an autofluorescent cell.
- Zenzprotein encodes gene sequence, which is under the control of the Ca ⁇ promoter (for CadC regulator in Escherichia coli see Mol. Mic. 51 (2004), pages 1.401 -1.412).
- an increased intracellular concentration of diamines such as cadaverine or putrescine leads to an expression of the autofluorescence protein.
- such a cell preferably also has a gene sequence coding for the CadC regulator.
- the DNA sequence of the CadC regulator regulated cadB promoter is shown in SEQ. ID. -No. 1 1 and the sequence of the CadC regulator itself in SEQ. 12 reproduced.
- the genetically modified cell according to the first embodiment may be a genetically modified cell, preferably a genetically engineered Corynebacterium glutamicum cell, which comprises a gene sequence coding for an autofluorescent protein, which is under the control of the metY protein. , metK, hom, cysK, cysl, or sww / J> promoter (to the McbR regulator in Corynebacterium glutamicum and the promoter sequences that are regulated thereby, see Mol. Mic. 56 (2005), p. 871 - 887).
- an increased intracellular concentration of S-adenosyl homocysteine leads to an expression of the autofluorescent protein.
- Such a cell preferably has, in addition to the metY, metK, hom, cysK, cysI or sue promoter, and the gene sequence for an autofluorescence protein under the control of this promoter, also a gene sequence coding for the McbR regulator on.
- the DNA sequence of the McB regulator regulated / netZ promoter is shown in SEQ. ID. -No. 13 and the sequence of the MecR regulator itself in SEQ. ID. 14 reproduced.
- the genetically modified cell according to the first embodiment may also be a genetically modified cell, preferably a genetically modified Escherichia coli cell, which has one for an autofluorescent cell.
- a genetically modified cell preferably a genetically modified Escherichia coli cell, which has one for an autofluorescent cell.
- the gene sequence for an autofluorescent protein preferably also contains a gene sequence coding for the ArgP regulator.
- SEQ ID No. 15 The DNA sequence of the Ar O promoter regulated by the ArgO regulator is shown in SEQ ID No. 15 and the sequence of the ArgP regulator itself is shown in SEQ ID NO: 16.
- the genetically modified cell may be a genetically modified cell, preferably a genetically engineered Corynebacterium glutamicum cell, which comprises a gene sequence coding for an autofluorescent protein under the control of the ysE promoter (for the / ysE promoter and its regulator LysG see Microbiology, 147 (2001), page 1.765).
- a genetically engineered Corynebacterium glutamicum cell which comprises a gene sequence coding for an autofluorescent protein under the control of the ysE promoter (for the / ysE promoter and its regulator LysG see Microbiology, 147 (2001), page 1.765).
- ysE promoter for the / ysE promoter and its regulator LysG see Microbiology, 147 (2001), page 1.765.
- an increased intracellular concentration of L-lysine, L-arginine, L-histidine and L-citrulline leads to an expression of the autofluorescence protein.
- such a cell preferably also has a gene sequence coding for the LysG regulator.
- the DNA sequence of the lysE regulator regulated by the LysG regulator is shown in SEQ. 17 and the sequence of the LysG regulator itself in SEQ. 18 reproduced.
- the lysE gene encodes a secondary carrier that has no molecular or structural similarities to any of the 12 known transporter superfamilies involved in the efflux of organic molecules and cations. Due to its novel function and unusual structure, LysE was identified as the first member of a new translocator family.
- LysE which includes LysE, forms the LysE superfamily with the RhtB family and the CadD family, with a total of 22 members.
- the lysine exporter from Corynebacterium glutamicum is the only functionally characterized member of the LysE family to date.
- LysG has high similarities to bacterial regulatory proteins of the LTTR family (LysR type transcriptional regulator).
- L-lysine acts as an inducer of the LysG-mediated transcription of lysE.
- the two basic amino acids L-arginine and L-histidine, as well as L-citrulline inducers of LysG-mediated lysE expression.
- the genetically modified cell may be a genetically modified cell, preferably a genetically modified Escherichia coli cell, which comprises a gene sequence coding for an autofluorescent protein, which is under the control of fadE Biol, 29 (4) (2002), pages 937-943).
- a genetically modified Escherichia coli cell which comprises a gene sequence coding for an autofluorescent protein, which is under the control of fadE Biol, 29 (4) (2002), pages 937-943).
- FadR regulator in Escherichia coli.
- an increased intracellular concentration of acyl-coenzyme A leads to an expression of the autofluorescence protein.
- such a cell preferably also has a gene sequence coding for the FadR regulator.
- the DNA sequence of the FadR regulator regulated yärfE promoter is shown in SEQ. ID. -No. 19 and the sequence of the LysG regulator itself in SEQ. 20 reproduced.
- the genetically engineered cell according to the first particular embodiment may be a genetically engineered cell, preferably a genetically engineered Bacillus subtilis cell, which has one for a genetically engineered Bacillus subtilis cell Autofluorescent protein encoding gene sequence which is under the control of the yad promoter (for FabR regulator in Bacillus subtilis see, for example, J. Bacteriol L, 191 (2009), pages 6,320-6,328).
- the yad promoter for FabR regulator in Bacillus subtilis see, for example, J. Bacteriol L, 191 (2009), pages 6,320-6,328.
- an increased intracellular concentration of acyl-coenzyme A leads to an expression of the autofluorescent protein.
- such a cell preferably also has a gene sequence coding for the FabR regulator.
- the DNA sequence of the FabR regulator regulated yai / promoter is shown in SEQ. 21 and the sequence of the FabR regulator itself in SEQ. 22 reproduced.
- the genetically modified cell according to the first particular embodiment may be a genetically modified cell, preferably a genetically modified Escherichia coli cell, which comprises a gene sequence coding for an autofluorescent protein, which is under the control of the rhaSR protein.
- rhaBAD or r / m promoter for example, for the RhaR and RhaS regulator in Escherichia coli see J. Bacterio L, 189 (1) (2007), 269-271.
- an increased intracellular concentration of rhamnose leads to an expression of the autofluorescence protein.
- such a cell preferably also has a gene sequence coding for the RhaR or RhaS regulator.
- the DNA sequence of the RhaR regulator regulated rhaSR xotoxin is shown in SEQ. 23, the sequence of the rAa & 4 £> promoter in SEQ. 24, the sequence of the RhaR regulator in SEQ. 25 and the sequence of the RhaS regulator in SEQ. 26 reproduced.
- the genetically modified cell according to the third embodiment may also be a genetically modified cell, preferably a genetically modified Anabaena sp.
- a genetically modified cell acting as one for an autofluorescence protein coding gene sequence under the control of the hetC, nrrA or rfev5 promoter (for the NtcA regulator in Anabaena sp, see, for example, J. Bacteriol, 190 (18) (2008), pages 6.126-6.133).
- an increased intracellular concentration of oxoglutarate leads to an expression of the autofluorescent protein.
- such a cell preferably also has a gene sequence coding for the NtcA regulator.
- the DNA sequence of the NtcA regulator regulated AeiC promoter is shown in SEQ. 27, the sequence of the nrrA promoter in SEQ. 28, the sequence of the devB promoter in SEQ. 29 and the sequence of the NtcA regulator in SEQ. 30 reproduced.
- the genetically modified cell may be a genetically modified cell, preferably a genetically modified Mycobacterium sp.
- Cell comprising a gene sequence coding for an autofluorescent protein, which is under the control of the cbbLS-2 or cbbLS-1 promoter (for CbbR regulator in Mycobacterium sp, see, for example, Mol. Micr 47 (2009), Page 297).
- CbbR regulator in Mycobacterium sp see, for example, Mol. Micr 47 (2009), Page 297
- an increased intracellular concentration of ribulose-bis-phosphate leads to an expression of the autofluorescence protein.
- such a cell preferably also has a gene sequence coding for the CbbR regulator.
- the DNA sequence of the CbbR regulator in SEQ. 31 reproduced.
- the genetically modified cell according to the first particular embodiment may be a genetically modified cell, preferably a genetically modified Streptomyces cattleya cell, which comprises a gene sequence coding for an autofluorescent protein, which is under the control of the j ? eby4i? promoter (to the ThnU regulator in Strep- for example, Mol. Micr., 69 (2008), 633).
- a genetically modified Streptomyces cattleya cell which comprises a gene sequence coding for an autofluorescent protein, which is under the control of the j ? eby4i? promoter (to the ThnU regulator in Strep- for example, Mol. Micr., 69 (2008), 633).
- an increased intracellular concentration of thienamycin leads to an expression of the autofluorescence protein.
- such a cell preferably also has a gene sequence coding for the ThnU regulator.
- the DNA sequence of the ThnU regulator regulated pcbAB promoter is shown in SEQ. 32 and the sequence of the ThnU regulator itself in SEQ. ID. 33 reproduced.
- the genetically engineered cell according to the first particular embodiment may be a genetically engineered cell, preferably a genetically engineered Streptomyces viridochromogenes cell comprising a gene sequence coding for an autofluorescent protein, which is under the control of the avi7?
- A- Promoter for AviCl or AviC2 regulator in Streptomyces viridochromogenes see, for example, J. Antibiotics, 62 (2009), page 461).
- an increased intracellular concentration of avilamycin leads to an expression of the autofluorescence protein.
- Such a cell has preferably also a coding for the AviCl- and / or AviC2 regulatory gene sequence in addition to the AVZ 'i? A promoter and the gene sequence for a car fluorescent protein being under the control of this promoter.
- the DNA sequence of the AviCl or AviC2 regulator-regulated avzTto promoter is shown in SEQ. ID. 34 and the sequence of the AviCl or AviC2 regulator itself in SEQ. ID. 35 reproduced.
- the genetically engineered cell according to the first particular embodiment may be a genetically engineered cell, preferably a genetically engineered Nocardia uniformis cell comprising a gene sequence coding for an autofluorescent protein, which is under the control of the oc promoter (for example, for the NocR regulator in Nocardia uniformis see J. Bacteriol 191 (2009), page 1066).
- the oc promoter for example, for the NocR regulator in Nocardia uniformis see J. Bacteriol 191 (2009), page 1066.
- a cell preferably also has a gene sequence coding for the NocR regulator.
- the DNA sequence of the NocR regulator regulated nocF promoter is shown in SEQ. 36 and the sequence of the NocR regulator itself in SEQ. 37 reproduced.
- a first possibility consists, for example, in starting from a cell whose genome already comprises one of the promoters described above and preferably a gene sequence coding for the corresponding regulator, and then introducing a gene sequence coding for an autofluorescence protein into the genome of the cell in such a way this gene sequence is under the control of the promoter.
- the nucleic acid sequence of the promoter itself may be altered before or after integration of the gene sequence encoding the autofluorescent protein into the genome by one or more nucleotide exchanges, nucleotide deletions or nucleotide insertions for the purpose of enhancing promoter efficiency.
- a second possibility is, for example, to introduce into the cell one or more nucleic acid constructs containing the promoter sequence and the gene sequence coding for the autofluorescence protein under the control of the promoter, the nucleic acid sequence of the promoter itself also being characterized by one or more nucleotide sequences. Exchanges, nucleotide deletions or nucleotide insertions for the purpose of enhancing promoter efficiency can be changed.
- the insertion of the nucleic acid construct can be chromosomally or extrachromosomally, for example on an extrachromosomally replicating vector. Suitable vectors are those which are replicated in the respective bacterial strains. Numerous known plasmid vectors such.
- PZl (Menkel et al., Applied and Environmental Microbiology (1989) 64: 549-554), pEKEx1 (Eikmanns et al., Gene 102: 93-98 (1991)) or pHS2-l (Sonnen et al. Gene 107: 69-74 (1991)) are based on the cryptic plasmids pHM1519, pBLI or pGAl. Other plasmid vectors such.
- pCG4 US 4,489,160
- pNG2 Serwold-Davis et al., FEMS Microbiology Letters 66, 1 19-124 (1990)
- pAG1 US 5,158,891
- the expression of the gene sequence coding for the autofluorescence protein is controlled by means of a so-called "Jiboswich", whereby the expression at the level of transcription as well as by means of such a riboswitch can also be regulated at the level of translation.
- riboswitch is understood to mean regulatory elements that consist exclusively of mRNA and act both as a sensor and as a regulatory element.An overview of riboswitches can be found, for example, in Vitrechak et al., Trends in Genetics, 20 (1) (2004), Pages 44-50 Further details on the regulation of gene expression with riboswitch can also be found in the PhD thesis of Jonas Noeske (2007) entitled “Structural Investigations on Metabolite-Binding Riboswitch RNAs by NMR” presented by the Department of Biochemistry, Chemistry and Pharmacy the Johann Wolfgang Goethe University in Frankfurt am Main.
- Riboswitches can be used in the cells according to this second particular embodiment in that the gene sequence coding for the autofluorescent protein is functionally linked to a DNA sequence which is able to bind the metabolite at the level of the mRNA depending on the binding of the metabolite to the mRNA, either the further transcription along the DNA or the translation at the ribosomes is influenced.
- the riboswitch at the level of transcription or the level of translation regulates the expression of the gene sequence coding for the autofluorescent protein.
- the metabolite binds directly to a structured region in the 5 'UTR of the mRNA and induces a change in the RNA secondary structure.
- This conformational change in the 5 'UTR results in the modulation of the expression of the subsequent gene coding for the autofluorescent protein.
- the gene regulating Effect can be achieved either by influencing the transcription, translation or possibly also the RNA processing.
- the metabolite-binding region of riboswitches is a modular, independent RNA domain. The remainder of the riboswitch (expression platform) lies mostly downstream of the aptamer domain.
- the expression platform may base pair with regions of the aptamer domain, depending on whether or not a metabolite is bound to the aptamer domain. In most cases, these base pairings between the expression platform and the aptamer domain take place in the metabolite-unbound state and lead to the activation of gene expression. Conversely, these base pairings are prevented in the ligand-bound state, which usually leads to the inhibition of gene expression. Whether the regulatory mechanism affects transcription or translation depends on the secondary structure that the expression platform adopts in the metabolite-bound or unbound state. Often, the expression platform has sequences capable of forming a transcriptional and a transcriptional antiterminator, but the two secondary structures are mutually exclusive.
- Another frequently occurring motif is a secondary structure by which, depending on the metabolite binding state, the SD sequence (Shine-Dalgarno sequence) is converted into a single-stranded form or masked.
- the SD sequence When the SD sequence is masked by formation of a secondary structure, the SD sequence can not be recognized by the ribosome. In this way, premature transcriptional termination or translation initiation can be regulated by riboswitches.
- the lysine riboswitch from Bacillus subtilis (described by Grundy et al, 2009), for example, is the glycine riboswitch Bacillus subtilis (described by Mandal et al., Science 306 (2004), pages 275-279), the adenine riboswitch from Bacillus subtilis (described by Mandal et al Breaker, Nat. Struct. Mol. Biol.
- riboswitch elements can also be used, such as the theophylline riboswitch (described by Jenison et al., Science 263 (1994), pages 1425-1429 or by Desai and Gellivan, J. Am. Chem. Soc. 126 (2004), pp.
- a further contribution to the solution of the abovementioned objects is provided by a method for identifying a cell with increased intracellular concentration of a specific metabolite in a cell suspension, comprising the procedural steps:
- a cell suspension comprising the above-described inventive, compared to their wild-type genetically engineered cells comprising a gene sequence coding for an autofluorescent protein, wherein the expression of the autofluorescent protein is dependent on the intracellular concentration of a particular metabolite; ii) genetically engineering the cells to obtain a cell suspension in which the cells differ in intracellular concentration of a particular metabolite; iii) identifying individual cells in the cell suspension with increased intracellular concentration of that particular metabolite by detecting intracellular fluorescence activity.
- step i) of the method according to the invention first of all a cell suspension comprising a nutrient medium and a large number of the genetically modified cells described at the outset are provided.
- step ii) of the method of the invention one or more of the cells in the cell suspension are then genetically engineered to obtain a cell suspension in which the cells differ in intracellular concentration of a particular metabolite.
- the genetic engineering of the cell suspension can be carried out by targeted or by undirected mutagenesis, with undirected mutagenesis being particularly preferred.
- mutations are selectively generated in certain genes of the cell. Mutations include transitions, transversions, insertions and deletions. Depending on the effect of the amino acid exchange on the enzyme activity, one speaks of missense mutations or nonsense mutations. Insertions or deletions of at least one base pair in a gene result in rame shift mutations that result in the incorporation of incorrect amino acids or the premature termination of translation, deletions of several codons typically leading to complete loss of enzyme activity Such mutations are well known in the art and can be found in well-known textbooks of genetics and molecular biology, such as the textbook by Knippers (Molecular Genetics, 6th ed., Georg Thieme Verlag, Stuttgart, Germany, 1995), Winnacker's.
- Such methods for mutation triggering are well known and may include at Miller (5 4 Short Course in BAC TERIAL Genetics, A Laboratory Manual and Handbook for Escherichia coli and Related Bacteria “(Cold Spring Harbor Laboratory Press, 1992)) or in the manual, Jrfanual of Methods for General Bacteriology "of the American Society for Bacteriology (Washington D.C, USA, 1981).
- genetic modification of the cell in method step ii) may result, for example, in a particular cell as a result of an increased or decreased enzyme activity, an increased or decreased expression of a particular enzyme Increased or decreased activity of a particular transporter protein, increased or decreased expression of a particular transporter protein, a mutation in a regulatory protein, a mutation in a structural protein, or a mutation in an R A control element result in an increase in intracellular concentration of that metabolite by interaction with an appropriate regulator protein via the promoter or by interaction with a riboswitch element has an influence on the expression of the autofluorescence protein.
- a cell in which, as a consequence of the mutation, the concentration of a particular metabolite is increased is therefore characterized by the fact that in this cell the autofluorescent protein is formed.
- the gene for the autofluorescent protein thus acts as a reporter gene for an increased intracellular metabolite concentration.
- step iii) of the method according to the invention therefore, individual cells in the cell suspension with increased intracellular concentration of this particular metabolite are identified by detection of the intracellular fluorescence activity.
- the cell suspension is exposed to electromagnetic radiation in that frequency which excites the autofluorescent proteins to emit light.
- step iii) a further step iv), in which the identified cells are separated from the cell suspension, said separation preferably by flow cytometry
- FACS fluorescens acti- vated cell sorting
- HAT-FACS high througput fluorescence activated cell sorting
- a method for the production of a genetically engineered product compared to its wild type also contributes to the solution of the abovementioned objects Cell with optimized production of a specific metabolite, including the process steps:
- a cell suspension comprising the cells according to the invention described above which are genetically modified with respect to their wild type and which comprise a gene sequence coding for an autofluorescent protein, the expression of the autofluorescence protein being dependent on the intracellular concentration of a specific metabolite; II) genetically engineering the cells to obtain a cell suspension in which the cells differ in their intracellular concentration of a particular metabolite;
- the genetically modified genes Gi to G n or those mutations Mi to M m which are responsible for the increased intracellular concentration of the particular metabolite are then identified in the identified and separated cells by genetic engineering methods known to those skilled in the art, the numerical value of n and m, respectively, depends on the number of observed altered genes or mutations observed in the identified and separated cell.
- the procedure is to first analyze the sequence of those genes or promoter sequences in the cells known to stimulate the formation of a particular metabolite. In the case of L-lysine as a metabolite, these are, for example, the genes lysC, hom, zwf, mqo, leuC, gnd or pyk.
- a genetically modified cell with optimized production of the particular metabolite whose genome comprises at least one of the genes Gj to G n and / or at least one of the mutations Mi to M m can then be produced .
- one or more of the advantageous altered genes G observed in method step V) or modified mutations M are introduced into a cell in a targeted manner. This specific introduction of specific mutations can be carried out, for example, by gene expression.
- a mutation such as deletion, insertion or base exchange is made in the gene of interest in vitro, and the allele is in turn cloned into a non-replicable vector for the target host after homologous recombination by means of a first, integration-causing "crass-ove / -" event and a suitable second excision-causing "cross-over” event in the target gene or in the target sequence one achieves the incorporation of the mutation or the allele.
- a contribution to the solution of the abovementioned objects is also provided by a cell with optimized production of a specific metabolite, which was obtained by the method described above.
- the genetically modified cells according to the invention produced in process step (a) with optimized production of a particular metabolite can be used in process step (b) continuously or batchwise in the batch process (batch cultivation) or in the fed-batch process (feed process) or repeated-fed-batch -V (repetitive feed method) for the purpose of production of the metabolite are cultured in the nutrient medium. Also conceivable is a semi-continuous process, as described in GB-A-1009370.
- a summary of known cultivation methods are in the textbook of Chmiel ⁇ , ßiolubtechnik 1. Introduction to bioprocess engineering "(Gustav Fischer Verlag, Stuttgart, 1991)) or in the textbook by Storhas (" JBiore actuators and peripheral facilities ", Vieweg Verlag, Braunschweig Wiesbaden , 1994).
- the nutrient medium to be used must suitably satisfy the requirements of the respective strains. Descriptions of culture media of various microorganisms are contained in the Handbook, Jnual of Methods for General Bacteriology of the American Society for Bacteriology, Washington, DC, USA, 1981.
- the nutrient medium can be carbohydrates, such as glucose, Sucrose, lactose, fructose, maltose, molasses, starch and cellulose, oils and fats such as soybean oil, sunflower oil, peanut oil and coconut fat, fatty acids such as palmitic acid, stearic acid and linoleic acid, alcohols such as glycerine and Methanol, hydrocarbons such as methane, amino acids such as L-glutamate or L-valine, or organic acids such as acetic acid These substances may be used singly or as a mixture.
- carbohydrates such as glucose, Sucrose, lactose, fructose, maltose, molasses, starch and cellulose
- oils and fats such as soybean oil, sunflower oil, peanut oil and coconut fat
- fatty acids such as palmitic acid, stearic acid and linoleic acid
- alcohols such as glycerine and Methanol
- hydrocarbons such as methane
- amino acids such as
- the nutrient medium may contain organic nitrogen-containing compounds such as peptones, yeast extract, meat extract, malt extract, corn steep liquor, soybean meal and urea, or inorganic compounds such as ammonium sulfate, ammonium chloride, ammonium phosphate, ammonium carbonate and ammonium nitrate.
- the nitrogen sources can be used singly or as a mixture.
- the phosphorus source may be phosphoric acid, potassium dihydrogen phosphate or dipotassium hydrogen phosphate or the corresponding sodium-containing salts.
- the nutrient medium must continue to contain salts of metals such. As magnesium sulfate or iron sulfate, which are necessary for growth.
- essential growth factors such as amino acids and vitamins can be used in addition to the above-mentioned substances.
- suitable precursors may be added to the nutrient medium.
- the said feedstocks may be added to the culture in the form of a one-time batch or added in a suitable manner during the cultivation.
- basic compounds such as sodium hydroxide, potassium hydroxide, ammonia or ammonia water or acidic compounds such as phosphoric acid or sulfuric acid are suitably used.
- acidic compounds such as phosphoric acid or sulfuric acid
- B. fatty acid polyglycol esters are used.
- the medium suitable selective substances such as B. antibiotics are added.
- oxygen or oxygen-containing gas mixtures such as air, registered in the culture.
- the temperature of the culture is usually 20 ° C to 45 ° C, and preferably 25 ° C to 40 ° C.
- a contribution to achieving the abovementioned objects is also made by a method for producing a mixture, comprising the method steps: (A) production of metabolites by the method described above;
- the mixture is preferably a food, most preferably an animal feed, or a pharmaceutical composition.
- FIG. 1 shows possible constructs in which the gene sequence of an autofluorescent protein (afp) according to the first embodiment of the cell according to the invention is under the control of a promoter (/ sE promoter).
- afp autofluorescent protein
- Example 2 shows the vector pJCllysGE'eYFP (lysisE'eYFP, coding sequence of the LysE'eYFP fusion protein prepared in Example 1, lysG, coding sequence of the regulatory protein LysG; kanR, coding sequence of kanamycin-mediated resistance; : Origin of replication: BamHI: recognition sequence and restriction enzyme BamHI site).
- FIG. 3 shows a confocal microscopy of the strains ATCC 13032 pJCllysGE'eYFP (above) obtained in Example 1 and DM1800 p JCllysGE'eYFP (below).
- the white bar in the lower figure corresponds to a length of ⁇ .
- Each 3 ⁇ l of cell suspensions were placed on a slide and immobilized through a thin layer of 1% agarose. The immobilized suspension was excited with light of wavelength 514 nm and an exposure time of 700 ms.
- the fluorescence emission measurement of eYFP was carried out with the Zeiss Axiolmager Ml using a broadband filter in the range of 505 nm to 550 nm.
- FIG. 4 shows the sequence of the gene sequence produced in Example 2 and based on a riboswitch element comprising a riboswitch element and a functionally linked riboswitch element for an autofluorescence element.
- zenzprotein encoding gene sequence bold: aptamner, italics: terminator sequence, underlined: EYFP).
- FIG. 5 shows the vector pJCllrp-bmF'eYFP.
- FIG. 6 shows the correlation of the internal L-methionine concentration with the fluorescence output signal of the ATCC13032pJCIIIrp-brnF '-eYFP cultures obtained in Example 3.
- FIG. 7 shows the formation of lysine by the mutants of the parent strain ATCC13032pSenLysTK-C in Example 4c).
- FIG. 1 shows possible constructs in which the gene sequence of an autofluorescent protein (afp) according to the first embodiment of the cell according to the invention is under the control of a promoter (ysE promoter).
- Variant A indicates an initial situation in which the metabolite-dependent regulator lies directly adjacent to its target gene (lysE), which it regulates depending on the metabolite concentration.
- target gene is replaced by a fluorescent protein (afp).
- variant C a translational fusion of the first amino acids of the target gene with the fluorescent protein has taken place.
- Variant D has a transcriptional fusion such that a long transcript is generated from the promoter region comprising the first amino acids of the target gene, terminated by a stop codon, followed by a ribosome binding site (RBS) and Open reading frame for the fluorescent protein.
- Variant E has a transcriptional fusion such that a long transcript is generated from the promoter region comprising the first amino acids of the target gene, ending by a stop codon followed by a ribosome binding site and the beginning of a known and well expressed one Protein such as the beta Galactosidase from E. coli, LacZ, which in turn is fused to the fluorescent protein.
- lysE 'fusion with the reporter gene eyfp (SEQ ID NO: 49; protein sequence of the eYFP: SEQ ID NO: 72) was achieved by overlap extension V' CR.
- the template used was pUC18-2.3 kb lysGE-BamHI, which carries the coding sequence of lysE together with the gene of the divergently transcribed regulator LysG (Bellmann et al, 2001, Microbiology 1471765-74), and pEKEx2-yfp TetR (Frunzke et al, 2008; JB acter iol. 190: 511 1-9), which enables the amplification of eyfp.
- the two oligonucleotide combinations peYFP rev (SEQ ID NO: 40) and peYFP_fw2 (SEQ ID NO: 41) were used.
- coli DH5aMCR and transformants were selected on LB plates containing 50 ⁇ g ml kanamycin. Twenty colonies grown on these plates and thus kanamycin resistant were used for colony PCR. The colony PCR was performed with each of the above-described oligonucleotide combinations to check whether the fragment lysGE'eyfp was inserted in the vector pJCl. Analysis of colony PCR in an agarose gel revealed the expected 1010 bp PCR product in the samples analyzed, whereupon a colony was cultured for larger scale plasmid preparations.
- Competent cells of the C. glutamicum strains ATCC 13032 and DM1800 were prepared as described in Tauch et al, 2002 (Curr Microbiol. 45 (5) (2002), pp. 362-7).
- Strain ATCC 13032 is a wild-type excrete lysine
- strain DM1800 was made a lysine secretor by gene-directed mutations (Georgi et al., Metab Eng.7 (2005), pp. 291-301).
- These cells were transfected with pJCllysGE'eYFP as in Tauch et al. (Curr Microbiol. 45 (5) (2002), pages 362-7) described by electroporation.
- the examination of the in vivo fluorescence emission took place via confocal microscopy with the Zeiss Axiolmager Ml.
- 3 ⁇ l cell suspension of the strains ATCC 13032 pJCllysGE'eYFP and DM1800 pJCllysGE'eYFP were placed on a slide on which a thin layer of 1% agarose had previously been applied for immobilization.
- the immobilized suspension was excited with light of wavelength 514 nm and an exposure time of 700 ms.
- the fluorescence emission measurement of eYFP was performed using a broad band filter in the range of 505 nm to 550 nm. Fluorescent cells were digitally documented using the AxioVision 4.6 software.
- ARS adenine riboswitch
- Bacillus subtilis The adenine riboswitch (ARS) from Bacillus subtilis (see Mandai and Breaker, Nat Struct Mol Biol, 11 (2004), pages 29-35) was first prepared starting from genomic DNA from Bacillus subtilis with the primers ARS_for (SEQ ID NO 42) and ARS_rev (SEQ ID NO: 43).
- ARS_for SEQ ID NO 42
- ARS_rev SEQ ID NO: 43
- the ARs amplicon purified with the Qiagen MinElute Gel Extraction Kit was amplified with 5 'terminal BamHI and 3' terminal Ndel and cleaved with these restriction enzymes.
- the reporter gene eyfp was amplified on the basis of pEKEx2-EYFP with the primer EYFP for Ndel (SEQ ID No. 44) and EYFP revJEcoRI (SEQ ID No. 45), restricted with the enzymes Ndel and EcoRI and also purified with Qiagen MinElute Gel Extraction Kit.
- ARS for: 5'-TCAACTGCTATCCCCCCTGTTA-3 '
- ARS rev 5 '-AAACTCCTTTACTTAAATGTTTTGATAAATAAA-3'
- EYFP rev EcoRI 5'-tag A ATTCTTATCTAG ACTTGTAC AGCTCG-3 '
- the two restricted PCR products were ligated together in the previously restricted with BamH ⁇ and EcoR ⁇ vector pEKEx2 and thus placed under the control of the IPTG-inducible promoter ptac.
- E. coli XLI blue was subsequently transformed with the ligation mixture.
- Kanamycin-resistant transformants were tested by colony PCR for the presence of the construct pEKEx2-ARS-EYFP (primer pEKEx2_for (SEQ ID NO: 46) and EYFP rev (SEQ ID NO: 47)) and the Plasmid purified for further analysis.
- EYFP rev 5 'tag AATTCTTATCT AG ACTTGTAC AGCTCG-3'
- the construction of the fusion of bmF with the reporter gene eyfp was as follows. In two separate reactions, first the coding lrp and the first 30 nucleotides of the braF sequence (brnF 1 ) including the intergeneric region (560 bp) with the oligonucleotide pair lrp-fw-A-BamHI (SEQ ID No.
- lrp -brnF-rv-I-Ndel SEQ ID NO: 51
- eyfp 751 bp
- the template used was genomic DNA from C. glutamicum, as well as the vector pEKEx2-yfp-tetR (Frunzke et al, 2008, J. Bacteriol 190: 51 1 1-51 19), which enables the amplification of eyfp.
- oligonucleotides fw-A-BamHl and lrp-braF-rv-I-Ndel were labeled with 5'-terminal BamHl and Ndel restriction sites, the oligonucleotides eyfp-fw-H-mfel and eyfp-rv-O-Scorro with 5 '. - supplemented terminal Ndel and Sali restriction sites.
- the ligation mixture was used directly to transform E. coli DH5a.
- the selection of transformants was carried out on LB plates with 50 ⁇ g / ml kanamycin. Colonies grown on these plates and thus kanamycin-resistant were used for colony PCR.
- the colony PCR was carried out with oligonucleotides flanking the region of the "multiple cloning site" in the vector pJCl.
- the analysis of the colony PCR in an agarose Gel had the expected 1530 bp PCR product in the samples analyzed, whereupon a colony was cultured for larger scale plasmid preparations, and the presence of the inserted fragment was detected by digestion with the restriction enzymes BamHI, Ndel and Scorro The sequencing of the insert showed 100% agreement with the expected sequence.
- the transformation of competent C was carried out with oligonucleotides flanking the region of the "multiple cloning site" in the vector pJCl.
- glutamicum cells with the vector pJCllrp-bmF'eYFP was carried out according to the method of Tauch and Kirchner (Curr Microbiol. (2002) 45: 362-367), and the strain C. glutamicum ATCC13032 pJCllrp -bmF'eYFP received.
- lrp -brnF-rv-I-Ndel 5 '-GCGCC ATATG ATATCTCCTTCTTAAAGTTCAGC- TTGAATGAATCTCTTGCG-3'
- Seq_pJCl_forl (SEQ ID NO: 54) 5 '-CG ATCCTG ACGC AG ATTTTT-3' Seq_pJCl_revl (SEQ ID NO: 55) 5 '-CTC ACCGGCTCC AG ATTTAT-3' b) Correlation of intracellular Metbionine concentration with the fluorescence output
- the sensitivity and dynamic range of the L-methionine sensor were determined.
- various internal concentrations of methionine were adjusted with peptides in ATCC13032 pJCllrp-bmF'eYFP. This method is described, for example, in Trötschel et al., (J. Bacteriol., 2005, 187: 3786-3794).
- the following dipeptides were used: L-alanyl-L-methionine (Ala-Met), L-methionyl-L-methionine (Met-Met), and L-alanyl-L-alanine (Ala-Ala).
- the culture was carried out with 0.6 ml medium in Microtiter scale (Flowerplate® MTP-48-B) in the BioLector system (m2p-labs GmbH, Forckenbeckstrasse 6, 52074 Aachen, Germany). Seven minutes after addition of the peptides, cells from 200 ⁇ l of the cell suspension were separated from the medium by means of silicone oil centrifugation and inactivated as described by KJingenberg and Pfaff (Methods in Enzymology 1967; 10: 680-684). The cytoplasmic fraction of the samples was worked up as in Ebbinghausen et al. (Arch. Microbiol.
- the pJCllrp-brnF'eYFP sensor plasmid allows the intracellular detection of methionine in a linear range of about 0.2-25 mM. It is already possible to detect an AJ accumulation of methionine in the lower mM range ( ⁇ 1 mM).
- the vector pJCl is described in Cremer et al. (Molecular and General Genetics, 1990, 220: 478-480). This vector was cut with BamHI and Sali, and with that by GATC (GATC Biotech AG, Jakob-Stadler-Platz 7, 78467 Konstanz) were synthesized using 1.765 kb fragment 5a / n // I - ⁇ - EYFP-lysE'-lysG -> -. Sa / I (SEQ ID No. 56).
- the resulting vector pSenLysTK was digested with the restriction enzyme BamHI, and with the 2.506 kb fragment 2? A /? JHT T7terminator - ⁇ - Crimson- LacIQ synthesized by GATC (GATC Biotech AG, Jakob-Stadler-Platz 7, 78467 Konstanz) -> - 5amHI (SEQ.ID: No. 57).
- the resulting vector was named pSenLysTK-C. It contains EYFP as a transcriptional fusion and as a live marker the protein Crimson.
- the sensor plasmid pSenLysTK-C was transformed into competent cells of the wild-type as described by Tauch et al. Microbiol., 45 (2002), pp. 362-7), and the strain Corynebacterium glutamicum ATCC 13032 pSenLysTK-C was obtained.
- the prepared strain ATCC13032 pSenLysTK-C was grown overnight in the medium at 30 ° C in the medium, 5 ml of this culture (Difco, Becton Dikinson BD, 1 Becton Drive, Franklin Lakes, NJ USA) 0.1 ml of a solution of 0.5 mg of N-methyl-N-nitroso-N'-nitroguanidine, dissolved in 1 ml of dimethylsulfoxide, which was shaken for 15 minutes at 30 ° C. Subsequently, the cells were incubated at 4 ° C.
- the FACS settings were threshhold boundaries for the forward scatter and f side scatter 500 at an electronic gain of 50 mV for the / orward scatter (ND filter 1.0) and 550 mV for the ide scatter ".
- Excitation of EYFP occurred at a wavelength of 488 nm and detection by means of parameter gain (PMT) of 530 to 30 at 625 mV
- Excitation of Crimson was carried out at a wavelength of 633 nm and detection by PMT from 660 to 20 at 700
- Two million Crimson-positive cells were sorted into 20 ml of CGXII-Kan25 and the culture cultured for 22 hours at 180 rpm and 30 ° C.
- isopropyl- ⁇ -D-thiogalactopyranoside was added again to a final concentration of 0.1 mM
- 18,000,000 cells were analyzed for EYFP and Crimson fluorescence at a rate of 10,000 particles per second, and 580 cells were sorted out and placed on BHIS-Kan25 plates using the FACS Aria II cell sorter Incubated for 16 h at 30 ° C.
- 270 were grown, all of which were transferred to 0.8 ml of CGXII-Kan25 in microtiter plates and cultured for 48 h at 400 rpm and 30 ° C.
- the already known mutations T311L T308I, A279T, A279V, and A279T were obtained.
- the new mutations H357Y (cac-> tac), T313I (acc-> atc), G277D (ggc-> gac), and G277S (ggc-> agc) were obtained.
- the coding triplet of the wild-type is indicated in each case, and subsequently the mutant correspondingly mutated.
- hom-289F SEQ ID NO: 60
- thxB-2069R SEQ ID NO: 61
- hom-289F 5'-CCTCCCCGGGTTGATATTAG-3 '
- thrB-2069R 5 '-GGCC AGCACGAATAGCTTTA-3' There were the new mutations A346V (gct-> gtt), V21 1 F (gtc-> ttc), G241S (ggt-> agt), A328V (gct-> gtt), T233I (acc-> atc), and the Double mutation R158C (cgc-> tgc) T3511 (acc-> atc).
- Further sequencing of thrB in the mutants with the primer pair hom-1684F (SEQ ID NO: 62) and thrB-2951R (SEQ ID NO: 63) revealed the new mutation S102F (tcc> ttc ).
- murE was additionally sequenced.
- the murE gene was amplified with the primers murE-34F (SEQ ID NO: 66) and murE-1944R (SEQ ID NO: 67), and the amplificates in GATC (GATC Biotech AG, Jakob Stadler-Platz 7, 78467 Konstanz).
- murE-34F 5'-AACTCCACGCTGGAGCTCAC-3 '
- the resulting strain C. glutamicum Lys39 was then cultured in 50 ml of BHIS-Kan25 at 30 ° C and 130 rpm for 12 h. From this culture, 500 ⁇ was transferred to 50 ml of CGXII-Kan25, and cultured again at 30 ° C and 130 rpm for 24 hours. From this, the 50 ml CGXII main culture was inoculated with an initial OD of 0.5 and cultured for 48 h at 130 rpm and 30 ° C. The culture supernatant was diluted 1: 100 with water, and the L-Lysine concentration obtained in Table 1 was determined by HPLC.
- gtaaagtgtc cagttgaatg gggttcatga agctatatta aaccatgtta agaaccaatc 60 attttactta agtacttcca taggtcacga tggtgatcat ggaaatcttc 110
- ttaatttgca tagtggaat tttttgccag actgaagagg tcataccagt tatgacctct 60 gtacttataa caacaacgta aggttattgc gctatgcaaa cacaaatcaa agttcgtgga 120 tatcatctcg acgtttacca gcacgtcaac aacgccct accttgaat 169
- gcagtgcttc gcccgctacc ccgaccacat gaagcagcac gaettettea agtccgccat 600 gcccgaaggc tacgtccagg agcgcaccat ettetteaag gaegaeggea actacaagac 660.
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DE102012016716A1 (en) | 2012-08-22 | 2014-02-27 | Forschungszentrum Jülich GmbH | A process for the preparation of vectors comprising a gene coding for an enzyme which has been reduced or eliminated in its feedback inhibition and the use thereof for the production of amino acids and nucleotides |
DE102012017026A1 (en) | 2012-08-28 | 2014-03-06 | Forschungszentrum Jülich GmbH | Sensor for NADP (H) and development of alcohol dehydrogenases |
DE102012024435A1 (en) * | 2012-12-14 | 2014-07-10 | Forschungszentrum Jülich GmbH | A method of identifying a cell having an intracellular concentration of a particular metabolite which is higher than its wild type, wherein the alteration of the cell is achieved by recombining, and a method of producing a genetically modified cell of its wild type with optimized production of a particular metabolite, a method of Production of this metabolite, as well as suitable nucleic acids |
WO2014158594A1 (en) * | 2013-03-14 | 2014-10-02 | President And Fellows Of Harvard College | Methods for selecting microbes from a genetically modified library to detect and optimize the production of metabolites |
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ES2758096T3 (en) | 2015-03-25 | 2020-05-04 | Senseup Gmbh | Sensors for the detection and quantification of microbiological protein secretion |
AU2016247794A1 (en) | 2015-04-13 | 2017-11-02 | President And Fellows Of Harvard College | Production and monitoring of metabolites in cells |
US11129906B1 (en) | 2016-12-07 | 2021-09-28 | David Gordon Bermudes | Chimeric protein toxins for expression by therapeutic bacteria |
US11180535B1 (en) | 2016-12-07 | 2021-11-23 | David Gordon Bermudes | Saccharide binding, tumor penetration, and cytotoxic antitumor chimeric peptides from therapeutic bacteria |
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CN109679886B (en) * | 2017-10-18 | 2022-05-10 | 中国科学院天津工业生物技术研究所 | High-throughput screening method based on biosensor |
JP6991897B2 (en) * | 2018-03-13 | 2022-02-03 | 旭化成株式会社 | Nucleic acids and vectors for controlling gene expression in non-phototrophic C1 metabolizing microorganisms, and transformants thereof |
CN109932408B (en) * | 2019-01-21 | 2021-07-13 | 宁波大学 | Preparation method and application of electrochemical biosensor based on coenzyme A aptamer |
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JPS5835197A (en) | 1981-08-26 | 1983-03-01 | Kyowa Hakko Kogyo Co Ltd | Plamid pcg 2 |
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